Journal bearing for railway-car axles



Feb. 10, 1931. o. HUBNER 1,792,305

JOURNAL BEARING F OR RAILWAY cm AXLES Filed Feb. '1. 1929' lh ffiesses: I I [Fire/2191:.

Patented Feb. 10, 1931 UNITED STATES PATENT oFncs VEBEHTIGTE STAHLWEBKE AKTIEN'GESEILSCHAFT, OF DUSSELDO RF, GERMANY JOURNAL BEARING ma RAILWAY-can mas Application filed February 1, 1929, Serial No 386,721, and in. Germany March 19, 19 28.

In bearings, especially in journal bearings for railway car axles, the rotation of the journals has sometimes been utilized to scoop oil from an oil sump by means of conveying 5 devices fixed on the journals, and to supply this oil to the bearings. Devices of this type.

work very satisfactorily but possess the inconvenience that lubricant in excess is supplied to the hearing, which is vdiliicult to return to the oil sump. In bearings of this kind provision must be. made for returning the oil into the sump without loss and further for preventing the packing of the axle box at --the rear, which is always rather diflicult, from being rendered more diflicult or even impossible owing to the oil particles moved towards the rear. For this purpose it has been proposed to mount on the emergency journal of the axle centrifugal rings designed 0 to prevent the creeping up of any oil particles. This, however c arr not be completely attained for reasons which will be hereinafter explained. It has therefore been nee-- essaryto arrange a packing against outflow- 5 ing oilon the rear si e of the axle box, which packing is expensive and is efiective only when it is pressed with sufiicient pressure against the emergency journal,

The arrangement, hereinafter described 0 obviates the above-mentioned inconveniences, i-. e; it prevents the escape of the oil, simplifies the packing on the rear side of the axle box so that it acts merely as a dust-proof packing and prevents at 'the same time any undesirable loading of the axle journal, seeing that arreifective dust-proof packing can be attained without the packing means being pressedheavily against the axle journal or against the emergency journal. The ar- 40 rangement according to the inventionis especially adapted foraxle bearings with onepiece bearing bush and it will be hereinafter mainly described in its application-to such bearings.

4 5 A form of construction of the invention is ;illustrated by way of example in the "only figure of the'accompanying drawing in longitudinal section with'parts in elevation. On the journal axle a, a one,piece bearing e0 bush is mounted On the emergency jouration with the cut out 'flowing out of the bearing bush 6 in rearward direction will travel onto the curved surface 7', forming the shoulder between the axle journal and the emergency journal, up

to the flan e e of the oil centrifuge and be thrown ofi When the axle is at rest, the last oil particles will remain on the rin [e in the form of drops or as an oil ring and e distributed over the surfaceof the bush (1 as soon as the axle again commences to rotate.

The oilv supply tothe rear being mostly excessive, the space a: will not be sufficient to hold the oil in excess or to positively prevent the oil centrifuge from supplying the oil. It might even be possible, owlng to the revolving of the oil centrifuge, for considerable quantities of oil to be held back in this s ace w'. On the other hand it is not possib e to make the s ace a; of any desired s ze in view underthe centrifugal actionof the utillzation' of the length of the axle so that the above mentioned danger actually exists.

This however is the cause of the above-mentioned difliculty in keeping the packing tight.

According to the invention these inconveniences are absolutely avoided by -provid-. ing in the rear end of thebearing bush b a cut out portion indicated by the dash line It.

As experiments have shown, the oil escapin in rearward direction flows along the face which is arranged so that the oil drips ofi' directly'into the oil receptacle. The bearing bush d, which tightly encloses the axle journal b at its upper portion, acts in co-operortion it like an oil stripping device and e ects a positive guidance of the oil along the face it. This obviates the necessity of enlarging the space m which could only be effected by shortening the emergency ournal. Further, the supporting surface of the bearing is not shortened by the new arrangement; the rear lower portion of the bearin ,bush can be cutout without causing any etrimental effect. What-I claim is:

1. In an oil returning device on railway we I axle bearings with one-piece bearing bushes, a bearing bush having a lower part shorter than the upper part towards the packing side, and an inclined surface at each side of the upper part, near the inner edge thereof.

2. In an oil returning device on railway axle bearings a bush as specified in claim 1 in which the inclined surfaces bear with their inner edge against the axle journal.

In testimony whereof, I have hereunto set my hand.

OTTO HI'JBNER. 

